Tobacco web severing machine having a reciprocating roller cooperating with a fixed knife in both directions of traverse



Nov. 3,- 1964 s. CLAUSEN 3,154,987

TOBACCO WEB SEVERING MACHINE HAVING A RECIPROCATING ROLLER COOPERATINGWITH A FIXED KNIFE IN BOTH DIRECTIONS OF TRAVERSE 4 Sheets-Sheet 1 FiledApril 25, 1961 INVENTOR CLAUSEN ATTORNEY 3,154,987 ING S. CLAUSEN Nov.3, 1964 TOBACCO WEB SEVERING MACHINE HAVING A RECIPROCAT ROLLERCOOPERATING WITH A FIXED KNIFE IN BOTH DIRECTIONS 0F TRAVERSE 4Sheets-Sheet 2 Filed April 25, 1961 FIG. 3

INVENTOR SIGURD CLAUSEN. BY

ATI'ORNEY Nov. 3,, 1964 s. cLAusEN 3,154,987

TOBACCO WEB SEVERING MACHINE HAVING A RECIPROCATING ROLLER COOPERATINGWITH A FIXED KNIFE IN BOTH DIRECTIONS OF TRAVERSE Filed April 25, 1961 4Sheets-Sheet s INVENTOR SI'GU RD GLAUSEN W 4.

ATTORNEY Nova 3, WM 5. CLAUSEN 3,154,987

TOBACCO WEB SEVERING MACHINE HAVING A RECIPROCATING ROLLER COOPERATINGWITH A FIXED KNIFE IN BOTH DIRECTIONS 0F TRAVERSE Filed April 25,1961 4Sheets-Sheet 4 I fl 86 206 204 v INVENTOR SIGURD OLAUSEN BYW A ATTORNEYUnited States Patent TOBACCO WEB SEVERING MACHINE HAVING A RECIPROCATING ROLLER CODPERATIN G WITH A FIXED KNIFE IN BOTH DHRECTIONS 0F TRAVERSESigurd Clausen, Brooklyn, N.Y., assignor to American Machine & FoundryCompany, a corporation of New Liersey Filed Apr. 25, 1961, Ser. No.105,459 6 Claims. (Cl. 83-152) This invention relates to a mechanism forfeeding materi-al fiom a continuous source to cutting means to sever asection therefrom.

Particularly the invention relates to a mechanism for feeding arelatively flimsy material, such as tobacco web material, from a supplythereof mounted on a reel, for instance, to cutting means for severing asection of predetermined contour, such as a binder or a wrapper for amachine made cigar.

The tobacco web material is generally limp and is ordinarily handledmechanically by cooperating feed rollers which are operatedintermittently in a feeding direction only and suction means whichlatter include a fixed suction table, a horizontally reciprocatingsuction head and a vertically reciprocating suction table, which lattercoacts with cutting means. In operation, the leading end of a web isfirst laid on a fixed suction table. Then it is picked up by thehorizontally reciprocating suction head which draws a predeterminedlength of it across cutting means secured generally to the verticallyreciprocating table. The cutting operation is then performed and the cutbinder or wrapper is then transferred by another displaceable suctionhead to another operating table in the cigar machine where the nextoperation is to be performed.

The vertically reciprocable table on which the binder or wrapper hasgenerally been cut to the desired contour is ordinarily actuable tothree positions, namely: 1. a lower position to which it is moved out ofthe path of the oncoming horizontally reciprocating suction head as theleading end of the web is drawn over the table prior to the cuttingoperation; 2. an intermediate position wherein it coacts with cuttingrollers to form the binder or Wrapper; and 3. an elevated position inwhich it presents the cut wrapper or binder to the suction transfer headwhich transfers it to the table where the next operation is to beperformed.

Because of the fact that the suction table on which the binder orwrapper is cut is not fixed in position, it has been found that onoccasion the wrapper or binder is not cut cleanly from the web. Variousexpedients have been employed to correct this difficulty but all of themleave something to be desired. The present invention proposes anarrangement which has been found to afford perfectly cut binders orwrappers from a web feed machine without fail. This is performed bysecuring the cutting means to an element which is fixed in position on arigid structure in the web feed mechanism.

An object of the invention is the improvement of web feed mechanismsemployed to cut contours from flimsy or limp material.

A particular object of the invention is to improve web feed machinesemployed to cut binders or wrappers from tobacco web material.

A feature of the invention is an immovable rigidly sup ported cuttingmeans in a suction type tobacco web feed machine.

Another feature of the invention is a knife secured to a fixed suctiontable rigidly supported by machine frame elements coacting with anabutting vertically actuable suction table in a tobacco web feedmachine.

ice

Another feature of the invention is an intermittent rack drive carriedby a reciprocating suction head carriage, which nack coacts with a gearon web feed rollers, which rack and coacting gear are arranged to stopdriving of the gear and feeding the web during a portion of the forwardmotion of the carriage while a cutting roller carried by the carriage istraversing a knife to sever a binder or wrapper from the web.

Another feature of the invention is a cutting roller secured to acarriage suction head which makes a double traverse of a fixed knife tocut a binder or wrapper in a cigar manufacturing machine.

These and other features of the invention will become apparent from thefollowing description when read with reference to the associateddrawings which taken together disclose a preferred embodiment in whichthe invention is presently incorporated. It is to be understood that theinvention is not limited to the disclosed embodiment but may beincorporated in other forms which will be readily suggested to thoseskilled in the art by the present disclosure. In the drawings:

FIG. 1 is a side elevation of the improved web feed of a cigar machine;

FIG. 2 is a partial sectional end elevation of the same, taken on line2-2 of FIG. 1;

FIG. 3 is a detailed sectional side elevation of the principal drivingmember of the web feed mechanism;

FIG. 4 is another end elevation of the web feed mechanism, taken on line44 of FIG. 1;

FIG. 5 is .a partial plan view, partly in section, of the web feed;

FIG. 6 is a sectional side elevation of the Web feed head, taken on line6-6 of FIG. 5, and

FIG. 7 is a sectional side elevation of the binder receiving andtransfer table.

The web feed mechanism of the present invention comprises a number ofcomponents well known in the art, which are described in detail in otherpatents and which will be described herein only insofar as it isnecessary to an understanding of the present invention. There are threesuch components and these and the patents in which they are described,the disclosures of which are incorporated herein by reference, are asfollows:

The support of the reel R from which the tobacco web is drawn, and thebrake mechanism which applies a desired restraining torque to preventoverrunning of the reel R while the web W is being drawn off the reel,are de scribed in Patent 2,960,898 granted to H. H. Wheeler,

November 22, 1960.

The mechanism which supports the vertically reciprocable suction tableand the controls therefor are described in Patent 2,846,010 granted toH. H. Wheeler, August 5, 1958.

A suction head transfer mechanism suitable for transferring the cutbinder or wrapper to another table in the cigar manufacturing. machine,where the next succeeding operation is to be performed, is described andshown in Patent 2,287,004, granted to H. H. Wheeler, June 16, 1942.

Refer now to FIGS. 1, 2, 4 and 5.

The present Web feed mechanism forms a portion of a complete cigarmanufacturing machine. Only a few parts of the cigar machine itself,essential to an understanding of the operation of the web feedmechanism, are shown in the drawings herein. The bed plate 20 isattached to the side frame 21 of the cigar machine. The main shaft 22,FIGS. 1 and 4, on which are mounted four cams which coordinate thetiming of the operations of the components of the present machine, is aportion of the main shaft on the cigar machine. It is secured inbearings therein and is driven through gearing by a motor, all as iswell known and, therefore, it is considered, not

required to be illustrated. Similarly the shafts 24, 26, 2S and 232which mount hubs of levers activated by cams through cam followers, aresecured in bearings, not shown, in the cigar machine.

Certain of the major elements secured to the bed plate 20 will first bementioned and the apparatus which they support and their functions willbe described more in detail hereinafter.

A bracket 30, FIGS. 1 and 2, is secured to bed plate 20 by four bolts,such as bolt 32. This bracket is used to support the web feed rollers 34and 3-6 together with their driving mechanism, the reel R with itstobacco web material, web tensioning rollers and brake.

A pair of brackets 38 and 39, FIGS. 1 and 4, secured to bed plate 29 bybolts such as at are used as support and bearings for shafts 42 and 44on which carriage 46 carrying travelling suction head 48 reciprocates.Two vertical bars 50 and 52, FIG. 1, secured to bed plate 20 by bolts,such as 54 and 56, support a rail 58, having a track 69, in which runs aroller 62 which supports the left-hand end of shaft 64 as seen best inFIG. 4. Shaft 64 serves as an axle to which the travelling suction head48 and the cutting roller 66 are attached. The main suction box 70,FIGS. 1 and 4, is secured to the side frame 21 and connected to a sourceof suction, not shown, through duct 71. From the main suction box '70suction is supplied to travelling suction head 48 through a flexible airhose 72, and also through air hose 74 to fixed suction chamber '76,which gives access to the suction chambers in the verticallyreciprocable table 30 and the fixed suction table 82 underlying the webmaterial adjacent table 86. Fixed suction chamber '76, FIGS. 1 and 4, isan integral part of bracket 90. Bracket 90 comprises also vertical ribs84 and Bracket 50 is secured to bed plate 2t? by bolts, such as bolt 92.The travelling suction carriage is reciprocated by means of a projection94, FIGS. 1 and 4, mounting a stud 96, which is connected through a linkdb and a stud 99 to the reciprocating lever The table 84) isreciprocated vertically by vertical shaft 102 which is connected by studthat to lever 166. The application of suction to, and the removal ofsuction from, the fixed suction box 76, the vertically actuable table8t}, the fixed table 82, FIGS. 5 and 7, and the travel ling suction head58 is controll d by a plate valve 1%, FIGS. 1 and 4, which is connectedby stud lid, to lever 112 which is in turn connected by stud 114 tolever 116.

The tobacco web material W is drawn off the reel R and over twotensioning rollers 118 and 1%. Roller 118 is mounted on shaft 122secured to bar 126 which is bolted to a projection 139 from bracket 31which is secured to bracket 30. Roller 12% is mounted on stud 124secured in bar 128 which is secured by stud 132 to projection 134 ofbracket 39. A brake band 136 has its inner end locked by stud 133 tobracket 31 and its outer end tied to stud 140 in an arm of bell cranklever 142 which is secured by stud 144 to projection 130 of bracket 31.The free end of hell crank 142 is connected through Stud 1 38 to bar 159the lower end of which is connected to a stud 152 secured in bar 128.Link is held in position on stud E52. by a washer and cotter pin, notshown. The lower end of link 1559 has an elongated vertical slottherein. Plate 151 is adjustably secured to link 15% by means of screws156. A spring 154 interconnects studs 148 and 152. When the web W is tobe drawn off the roll, lever 128 is raised, engaging plate 151 andtripping the brake mechanism. The brake band is effective to applydesired torque to the reel R and prevent overrunning of the web feedmaterial during the feeding operation.

The tobacco web material is drawn between the coacting web feed rollers34 and 36, FIG. 2, and at the start of operations, its leading end islaid on the fixed suction table 82 adjacent the knife. In order topermit the web to be drawn through the rollers 34 and 36, the upperroller is provided with an eccentric 170. A spring 172 tensioned betweena stud 174 on the eccentric lever and a stud 176 on bracket 30 maintainsthe rollers in engagement with the web material during normal operation.

As the travelling suction carriage 48 is reciprocated horizontally bylever 100, in a manner to be explained, a rack 178, FIGS. 1, 2 and 5,adjustably mounted on the carriage, engages gear 18% which is connectedthrough a clutch 182 to the lower roller 34. Secured to lower roller 34,near its left-hand end, as seen best in FIG. 2, is another gear 134which engages with gear 186 secured to the upper roller 3%. The elementsare so arranged that as carriage 48 moves toward the right, as seen inFIG. 1, carrying rack 1'78, motion is imparted to gear 180 and throughclutch 12 to gears 184 and 186 which are rotated in directions so thatrollers 34 and 36 cooperatively engage the web and feed it in theforward direction in which the carriage is moving to draw the leadingend of the web to a position over the vertically actuable table 86, sothat a section of the web lying beyond the fixed knife 166 may besevered.

Attention is now called to one of the features of the invention. Inorder to improve the cutting operation and insure a cleanly severedhinder or wrapper, the cutting roller 66 makes two operating traversesof the knife 160. That is to say, the knife is fixed in position so thatits cutting edge projects vertically slightly above the upper surface211 of the fixed suction table 82 and the horizontal level in whichvertically actuable table is maintained during a forward and backwardtraverse of the cutting roller 66. Reference to FIGS. 1 and 5 shows thatthe cutting roller is located at the rear of the carriage. It isnecessary to stop the web feeding operation as soon as the desiredamount of web material has been drawn beyond the knife 16b andthroughout the interval while the cutting roller 66 is traversing theknife in the forward direction. In order to permit this, it is necessaryto prevent the rack 178 from actuating the gear 184]. There are no teethon the left-hand end of rack 178, FIG. 3. This portion of the rack isflattened to engage with a flattened portion on the gear 180 with whichit coacts, so that the two cooperating, lock intermittent feed rollers34 and 36 during this period. Of course, it is to be understood that,during the entire return traverse of the carriage, clutch 182 isefiective to prevent operation of the feed rollers. It is pointed outalso that in drawing the web forward, the carriage operates justslightly faster than the rollers to insure that the web material is tautwhen it is drawn over the knife and deposited on the table 80.

Refer now to FIGS. 5 and 7 which disclose another important feature ofthe invention. The irregularly shaped knife which underlies the web W issecured to the forward edge of the fixed table 82 by bolts, such as bolt83,. The upper edge of knife 160, which coacts with the roller 66 toperform the cutting, projects slightly above the upper surface 211 offixed table 82 and also slightly above the position in which the uppersurface of vertically reciprocable table 80 is maintained during the cutting operation while cutting roller 66 is being drawn back and forthacross knife 160. Attention is particularly called to the fact that theknife does not move. The fixed table 82 is firmly supported by fixedsuction box 76 which is integral with and is supported by the twovertical ribs 84, 86 all of which form part of bracket 90, which issecured by bolts, such as bolts 92, to the base plate or bed 2% of thecigar machine. This arrangement insures a clean cut as the knife doesnot tend to wobble as is the case when the cutting means is secured tothe vertically reciprocable table.

It is to be understood that suction must be supplied to both the fixedtable 82 and the vertically actuable table 80 after the leading end ofthe tobacco web material has been drawn across the knife and the webmaterial is transferred from the travelling suction head to the twotables for the cutting operation.

This is performed in the present invention by providing the fixedsuction chamber 76, FIG. 7, the left-hand end of which underlies thefixed suction table 82. It performs the dual function of providing afirm support for knife 160 and a source of suction for both the fixedtable 82 and the vertically actuable table 80. From fixed suction box76, suction is applied to and withdrawn from fixed suction table 82through aligned apertures 200 and 202 in the upper surface of suctionbox 76 and the lower surface of fixed suction table 82 respectively.From fixed suction box 76, suction is applied to and removed fromvertically actuable suction table 80, through channel 204 in tube 206,which is secured to the lower surface of vertically actuable table 80and projects through an aperture in the upper surface of fixed suctionbox 76 into the interior thereof. This arrangement permits suction to beapplied to tables 80 and 82 while the tobacco web material is beingtransferred from the travelling suction head 48, to the tables, permitssuction to be maintained on the table during the cutting operation andduring the period while the vertically actuable table 80 is beingelevated just prior to the transfer of the cut binder or wrapper toanother displaceable suction head, not shown, which carries it to thetable where the next succeeding operation is to be performed. The uppersurface of the table 82 has apertures 210 and the upper surface of thedisplaceable table 80 has apertures 212 through which suction is appliedto and removed from the web material at required times.

The programming of a cycle of operations is under con trol of camsmounted on main cam shaft 22. The lever 100 which imparts horizontallyreciprocating motion to carriage 46 has a hub 220 mounted on shaft 26and is rotatable in a limited arc thereon. Between stud 99 and shaft 26,and secured to lever 100 by a stud 222 is an adjustable rod 224 which issecured to bell crank 226 by stud 228. Bell crank 226 is secured tobracket 230 and limitedly rotatable on stud 232. Bell crank 226 carriescam follower 234 which is actuated in track 236 in cam 238 which islocked to main shaft 22. As shaft 22 and cam 238 revolve, follower 234rocks bell crank 226 on stud 232 imparting horizontally reciprocatingmotion to adjustable rod 224. The motion is multiplied by bar 100 whichactivates carriage 46 through lever 98 and stud 96. The adjustable rod224 provides means for adjusting the position of the carriage to theknife. The adjustable arm 226 affords means for adjusting the travel ofcarriage 46 as required for different binders or wrappers. Arm 226 isprovided at its lower end with means for varying its effective length incoacting with bar 224 to afford different lengths of travel of carriage46.

The travelling head 46, FIG. 5, is secured to the shaft 64 by hubs 250and 252. The hubs are split, as shown at 254, FIG. 6, and are locked onshaft 64 by means of bolt 256, for instance. A stiffening bracket 260,FIG. 4, is secured to bracket 46, and carries a hub 262 to add supportto the axle 64.

The roller 66 is mounted in a bracket 270 and secured to the axle 64 bymeans of four hubs such as hub 272. The cutter roller is provided withan eccentric by means of which the cutting angle may be adjusted and isprovided with adjustable tension springs, stop screws and a cutterroller wiper, all as is Well known in the art. Only one cutter roller 66is required because there is no reverse angle on the cutting edge of theknife.

The web carriage may be swung up for cleaning by unloosening the clampscrews 256. On the under side of carriage 48 is a plate provided withsuction holes.

The suction box gate valve 108 is connected through lever 112 and bellcrank 116, which latter is secured to and rockable on shaft 24. Arm 280of bell crank 116 carries cam follower 282 which engages the peripheryof cam 284. As shaft 22 revolves, cam 284, locked to shaft 22, actuatesfollower 282, rocking bell crank 116 on shaft 24, in turn horizontallyreciprocating gate valve 108 so as to alternately present an aperture invalve 108 to the ducts in flexible air hose 72 and in conduit 74. Thecam 284 is arranged to control the operation of valve 108 so thatsuction is transferred from the web suction feed head 48 to the movableand fixed tables and 82 at the proper times in the operating cycle.Spring 290, tensioned between bell crank 116 and projection 292,depending from the bottom of the gate valve housing, normally maintainsfollower 282 in engagement with cam 284.

Vertically reciprocable table 80, as mentioned, is mounted on verticalshaft 102 and connected through a link 103, to stud 104 on bell crank106. Bell crank 106 is rockable on stud 28 and secured to its dependingarm is follower 302 which engages the periphery of cam 304. As shaft 22rotates, cam 304 locked thereto actuates follower 302, rocking bellcrank 106, and reciprocating ad-- justable shaft 102 and table 80vertically. Spring 310 tensioned between bell crank 106 and projection312 depending from bed plate 20 maintains follower 302 in engagementwith cam 304.

The transfer suction head, not shown, which transfers the cut web orbinder from table 880 to a table where the next succeeding operation isperformed has suction applied thereto and disconnected therefrom undercontrol of plate valve 320, which connects through bar 322 to hell cranklever 324, rockable on shaft 24 and carrying follower 326 which coactswith the periphery of cam 328 locked to shaft 22. As shaft 22 rotatescam 328 actuates follower 326, rocking bell crank 324 and verticallyreciprocating bar 322 and transfer head plate valve 320 which controlsthe application of suction to and the removal of suction from thetransfer head to which it is connected by a flexible suction duct, notshown.

To summarize, the mechanism operates as follows. The tobacco webmaterial W is drawn from the reel R by the two feed rollers 34 and 36and by the movable suction head 48 to the required length and is thenstopped. During this interval, suction is on suction head 48. Thevertically reciprocable table 80 is then actuated to a position directlyunder the head 48. Valve 108 is actuated to transfer suction from thehead 48 to the table 80 and transfer of the tobacco web material fromthe head to the vertically operable table 80 is thereby effected.Suction is also applied simultaneously to the fixed table 82. The table80 is lowered to a position slightly below the knife 160. The web isdrawn to the table 82 as it is deposited thereon by the lowering oftable 80. The web material is taut and distended, very slightly, by theslightly longer feed of the carriage 46 than of the rollers 34 and 36,and this condition is maintained while the web material is in thecutting position on tables 80 and 82. The carriage 46 continues itsforward movement after dropping the web material W so as to draw thecutting roller 66 over the upwardly projecting knife 160 and to therebysever the portion of web W which has been drawn forwardly of knife 160from the remainder of the web.

Reference to FIG. 3, shows the rack 178, the righthand portion of whichis provided with teeth of normal length to coact with teeth of normallength on gear 180. The traverse of the rack 178 is made adjustable bymeans of elongated slots 404 and 406 in rack 178. By this means, therack 178 may be secured to the carriage by screws 400 and 402 in anydesired position throughout the range afforded by the slots. Roller 35is secured to an eccentric stud mounted on bracket 30 which aids inmaintaining rack 178 in proper alignment.

After ending its forward movement, head 48 is drawn back by bar to thestarting position, and during this traverse the roller 66 again coactswith knife insuring a clean cut of the hinder or wrapper. The verticallyactuable table 80 is then moved upwardly carrying the cut binder orwrapper to a position directly beneath another movable suction head ortransfer, not shown. At this point, valves 108 and 320 are operated.Valve 108 cuts suction off from the vertically actuable table 80 andfixed table 82 and valve 320 applies suction to the other movablesuction head to pick up the 7\ cut binder or wrapper and to transfer'itto another table, not shown, where the next succeeding operation is tobe performed. The movable table 82 then is drawn downwardly by verticalbar 102 again to a position slightly beneath the knife 160 and the cycleis repeated.

What is claimed is:

1. A web feed mechanism, a base plate and a knife therein, said knifeintegral with said plate, feed means comprising suctional means in saidmechanism for feeding the leading end of a continuous web of filmy orlimp material to a position beyond said knife, suctional supports forsaid material on opposite sides of said knife, said knife abutting saidsupports, said knife having a cutting edge projecting slightly above thetop surface of said supports, a cutting roller attached to said feedingmeans, and other means for reciprocating said cutting roller back andforth across said knife, while engaging said knife on each traverse, toinsure the complete severance of said section from said Web, said feedmeans comprising also a pair of coacting web feed rollers whichcooperate in transporting said material across said knife, other meansresponsive to said reciprocation for driving said web feed rollersduring'a first portion only of the forward movement of said carriage,said other means comprising a rack on said carriage and a gear on one ofsaid web feed rollers, and means for disengaging said racks from saidgear during a secondportion of said forward movement of said carriage.

2. In a web feed machine, in combination, a bed plate, a suction tableimmovably secured to said bed plate, a knife secured to an edge of saidtable, said knife having a cutting edge proiecting slightly above theupper surface of said table, means in-said machine for supporting acontinuous web of tobacco material, a travelling suction head, means fordisplacing said head horizontally,- while carrying-a leading end of saidmaterial from a starting point to a first position beyond said knife, avertically reciprocating suction head coacting with said travellingsuction head, means for transferring said leading end of said materialfrom said travelling head to said vertically reciprocating head, meansresponsive to said transfer for then lowering said verticallyreciprocating head to a position slightly below said knife, means foractivating said travelling headafter said transfer to a second positionbeyond said transfer and returning it to said starting point, and acutting roller connected to said travelling head engageablewith saidcutting edge during said actuation of said travellinghead inbth-directions.-

3. A machine in accordance with claim 2, having a rack integral withsaid travelling head, a pair of rollers coacting together to feed saidweb material and having a driving gear on one thereof enacting with saidrack in advancing said leading end of said web material beyond saidknife and means in said rack and in said driving gear for preventingfurther feeding of said web by said pair of rollers while said cuttingroller is drawn over said knife in the direction in which said web isfed to said knife.

4. in a Web feed machine for feeding the leading end of a continuous webof tobacco material to cut a cigar binder or a cigar wrapper therefrom,in combination, a bed plate in said machine, a knife for severing saidbinder or wrapper from said leading end, said knife integral with saidbed plate, a travelling head having suction means therein for graspingsaid leading end, cam and linkage'means connected to said travellinghead for actuating said head, with said leading end attached thereto, toa first position beyond said knife, a pair of rollers coacting with saidtravelling head for feeding said web material, rack means connected tosaid travelling head engaging with gear means on said'rollers to assistsaid travelling head in feeding said material, means connected to saidtravelling head for releasing said leading end'at said first position, acutting roller connected to the rear endof said travelling head, saidcam and linkage means comprising means for actuating said travellinghead to a second position, beyond said first position, while-saidcutting roller coacts with said knife, and means for disabling saidcoasting feed rollers while said travelling head is travelling from saidfirst to said second position. 5.- A web feed machine in accordance withclaim 4 in Whichsaid disabling means-comprises a rack and a gearengaging said rack, said rack and said gear each having a sectionwhereon they are out of driving engagement, one from the other.

6. A web feed'machine in accordance with claim 4 in which said disablingmeans comprises a rack and a gear engaging with said rack, said gearhaving a section having fiattenedteeth thereon, and said rack having afiattened section thereon adapted to engage said flattened teeth, toform a positive lock, to stop further feeding of said web by saidrollers during the forward traverse of said cutting roller over saidknife.

References Cited in the file of this patent UNITED STATES PATENTS2,451,920 Clausen Oct. 19, 1948 2,846,010 Wheeler Aug. 5, 1958 2,960,898Wheeler Nov. 22, 1960 3,016,779 Gustavson et a1 Jan. 16, 1962

1. A WEB FEED MECHANISM, A BASE PLATE AND A KNIFE THEREIN, SAID KNIFEINTEGRAL WITH SAID PLATE, FEED MEANS COMPRISING SUCTIONAL MEANS IN SAIDMECHANISM FOR FEEDING THE LEADING END OF A CONTINUOUS WEB OF FILMY ORLIMP MATERIAL TO A POSITION BEYOND SAID KNIFE, SUCTIONAL SUPPORTS FORSAID MATERIAL ON OPPOSITE SIDES OF SAID KNIFE, SAID KNIFE ABUTTING SAIDSUPPORTS, SAID KNIFE HAVING A CUTTING EDGE PROJECTING SLIGHTLY ABOVE THETOP SURFACE OF SAID SUPPORTS, A CUTTING ROLLER ATTACHED TO SAID FEEDINGMEANS, AND OTHER MEANS FOR RECIPROCATING SAID CUTTING ROLLER BACK ANDFORTH ACROSS SAID KNIFE, WHILE ENGAGING SAID KNIFE ON EACH TRAVERSE, TOINSURE THE COMPLETE SEVERANCE OF SAID SECTION FROM SAID WEB, SAID FEEDMEANS COMPRISING ALSO A PAIR OF COACTING WEB FEED ROLLERS WHICHCOOPERATE IN TRANSPORTING SAID MATERIAL ACROSS SAID KNIFE, OTHER MEANSRESPONSIVE TO SAID RECIPROCATION FOR DRIVING SAID WEB FEED ROLLERSDURING A FIRST PORTION ONLY OF THE FORWARD MOVEMENT OF SAID CARRIAGE,SAID OTHER MEANS COMPRISING A RACK ON SAID CARRIAGE AND A GEAR ON ONE OFSAID WEB FEED ROLLERS, AND MEANS DISENGAGING SAID RACKS FROM SAID GEARDURING A SECOND PORTION OF SAID FORWARD MOVEMENT OF SAID CARRIAGE.